Steam generator



March 8, 1938.

w. H. WATSON 2,110,432

STEAM GENERATOR Filed Apri; 4, 1934 -2 Sheets-Sheet l INVENTOR.-

M arch 8, 1938. w. ||4 WATSON 2,110,432

S TEAM GENERATOR Filed April 4, 1934 2 sheets-sheet 2 Patented Mar. 8, 1938 REISSUED' MAR 51940;

UNITED STATES PATENT OFFICE STEAM GENERATOR deceased Application April 4, 1934, Serial No. 718,887

3 Claims.

This invention relates to a novel steam generator, or boiler and particularly applicable to industrial installations for generating steam under pressure or for heating liquids.

The primary object of this invention is to provide a steam boiler that is complete Within itself, portable, does not require a brick setting or furnace and could be effectively insulated, and a small boiler that Would operate at an overall eiciency equal to the larger installations.

A further object or this invention is to provide a boiler constructed in such a manner that the combustion chamber and the Water tube heating surfaces are enclosed Within a cylindrical shell and entirely surrounded by the liquid to' be heated, thereby increasing the eiiiciency of the heating surfaces and reducing the strain on the metal to a minimum.

A further object of this invention is to construct a steam boiler of the internally red type with a positive circulation of the liquid over the heating surface, reducing strain on the metal and adding to the efficiency of the boiler.

Another object of this invention is to construct 25 an internally red Water tube boiler which is accessible for cleaning or replacement of parts, and due to its compactness and simplicity would be economical to manufacture and install, either as a portable or stationary boiler.

Other objects and advantages of this invention Will be apparent during the course of the following detailed speciiication:

In the drawings, forming a part of this specication similar reference characters designate corresponding parts throughout the several Views. v

Figure 1 is a longitudinal section of the steam generating unit, with a side elevation of the superimposed steam separating drum. A fragmentary View of the Water tube chamber, and a section of the inspection opening at the end of the Water tube chamber is also shown.

Figure 2 is a front view of the boiler including the steam generating unit and the steam separating drum.

Figure 3 is a cross section of the steam separating drum taken substantially on the line C-C Fig. l.

Figure 4 is a half cross section of the steam generating unit taken substantially on the line A-A and a half cross section taken substantially on the line B-B Fig. l.

Figure 5 is a rear View of the steam generating unit, and

Figure 6 is a pictorial View of the refractory insulating tile surrounding the'steam generating unit.

In the drawings, wherein for the purpose oi illustration is shown only the preferred embodiment of this invention, the letter D indicates the improved steam generating unit and the letter E indicates the steam separating unit.

Referring to the steam generating unit D. In the drawings, number il] is the steam generator shell with the iront head l l and the back head l2 securely attached. I3 is a manhole cover held in place by the crab i4 and the crab bolt l5. Number i6 is an inspection plate located at the end of the Water tube heating chamber and held in place by the bolts Il passing through the ring I8 thus closing the opening formed by the nipple I9 which is securely fastened into the back head l2. Number 20 is a tubular combustion chamber one end of Which is securely fastened into an opening provided in the front head ll and extending back into the unit D to a point near the back head l2 and terminating with a blank end closed by the head 2l securely fastened thereto. The combustion chamber 2E! is connected With the two or more Water tube heating chambers 23 by the connecting nozzles 22.

Number 23 is a tubular shell with heads 24 securely fastened thereto, the heads 24 being drilled to receive a number of Water tubes 25 which pass through the interior of the tube 23 parallel with its longitudinal axis, forming a water tube heating compartment. Number 2G is a pipe connecting interior of the water tube compartment to the outside of the shell lll, it being suitably connected to the tube 23 and the shell l0. The shell l0 is enclosed by an insulating jacket of refractory tile 2l, the tile being formed to the contour of the shell lil and held a suitable distance from the shell by the boss 21a, located at the corner of each tile, thus forming a passage 28 between the shell I0 and the jacket 2l for the passage of gas around or over the shell. The tile jacket is protected, and the gas passage sealed by a sheet metal covering 29.

The sheet metal covering 29 is secured to the unit D by being fastened to the channel 29a which in turn, is Welded to the shell I0. Openings 30 are provided for the passage of the gas from the space 28 to the exhaust pipe 3|. These openings are preferably located 90 degrees apart around the unit D at the end opposite to the point Where the gas enters the passage 28 from the pipe 26. The openings 30 not in use are closed by a blank ilange 32 held in place by the bolts 33. The steam generating unit `D is conknected to the steam separating unit E by the uptake pipe 34 and the down pipe 35.. The'separating unit E consists of a cylindrical shell 36' with heads 31 securely attached in eachend thereof. This unit is provided with a steam outlet 38 and a water glass 39 and water glass connection valves Q0. The approximate watervline is indicated by the line X-X. The boilerassemblyvis supported by the columns 4l andthe braces 42. The steam generating unit D and theV steam separating unit E are fastened to the supi porting frame by the straps 43. sary braces, hangers, or supports would be of the conventional type and are not .included in the drawings. n

Referring to the steam generating unit, the Y operation would be as follows:

'I'he fuel would be flred'at the open end ofi the tubular combustion chamber 20, the products of combustion passing through the nozzles 22 vinto the two or more water tube heating chambers 23 where they would envelope the water tubes and'flow tothe opposite end of the tubulary water` tube chamber. vFrom the Water tube heatingchamber, the gas would owinto the pipe 26 and to the space 28 surrounding the shell l0 Where they would travel to theexhaust openings 30 and to the atmosphere, or to an economizer.

through the exhaust pipe 3l.

Referring to the boiler including the. steam generating unit D and the steam separating unit E, the water` circulation would be as follows: The

water `levelbeing at the line X-X in the steam separating unit, the entire Vgeneratingv unit including the down pipe and the uptake pipe 34,l would be filled' with water, and they heating element enclosed within ,the steam generating unit D, would be completely submerged inwater, or the liquidv to be heated. When'heat'is applied to the heating surfaces in the generating unit, the liquid would become lighter land move toward the elevated end of the generating unit, henceup through the uptake pipe intothe separating unit E. In the compartment E, the

steam would separate from the liquid and remain in the upper part of the drum, whilethe liquid would flow throughthe drum and return to the generating unit through the -downgpipel to be reheated, thus completing a continuous used in water tube boilers, alsofthat thereare a number of different kinds of internally `fired Other neces-f' boilers. Therefore, I do not claim these features broadly( What 'I claim is:

1. An internally red boiler comprising a steam generating unit consisting of a, water casing heating element including three tubular sections in the steam generating unit spaced substantially 120 degrees apart around a. common center parallel with the longitudinal axes of said tubular sections, one` of said tubular Asectionsl secured at one end to the Water casing and provided with.

'- an `opening at its fixed end the other 'end of said section terminating in a closed end and forming a. combustion chamber, the other two tubular sections each containing a .plurality yof water tubespassing-through the sections longitudinally and fastened into openings provided in the heads 1- ateachiend of each of said sections, tubes connecting the three sections each at one endand tubes connecting the opposite ends of said other two `sections to the outside of the casing, means for passing the hot gasesfrom the combustion tube `into the water chamber sections and to the `outside of the water casing.

2. A steam boiler, comprising a water casing, a heating element, including ai plurality of tubular sections in the generating unit substantially 120 degrees apart around a common centei`v parallel with the longitudinal axes of said tubular sections, one ofsaid tubular sections being closed at one end and fixed at the other endto the water casing, the fixed end provided with an opening, the other tubular sections Yeach having heads at the ends and each section containing a plurality ofv water tubes passing through ythe sections longitudinally and fastened into openings' :provided at the heads of each end of each of said sections, tubes connecting the saidf other sections each at one end to the combustion chamber and tubes connecting the opposite ends of said sections to the outside of the casing,` providing means for passing hot gases from the combustion chamber into the water tube sec-V tions and to the outside of the water casing.'l

3.` A steam-boiler, comprising a water casing, a heating element, including a, plurality of tubular sections in the generating unit spaced varound a .common center parallel with the longitudinal axes of said tubular sections, one. of

said-tubular sections being closed at one end and fixed at the other end to the water casing, the fixed -end provided with an opening, the other tubular sections each having heads at their ends` -and each Ysaid. other section containing a plurality of-water tubes passing through the sections longitudinally and fastened into openingsA provided at theV heads of veach end of each of said sections, tubes connecting the said other sections 'each at one end to the combustion chamber and tubes connecting the opposite ends of ysaid 'sections tojthe outside of the casing, pro- Vviding means forY passing `hot gases from the combustion chamber into the rwater tube sections the water casing.

and tothe outside of WILLIAM H. WATSON. 

